Yes, leftover milk can generally be used after boiling and chilling, as boiling helps kill bacteria and chilling slows down their growth. However, it's best to use it as soon as possible and check for any signs of spoilage before consumption.
Boiling milk is a common practice to eliminate harmful bacteria and extend its shelf life. When milk is boiled, the high temperature kills most of the microorganisms that can cause spoilage and illness. After boiling, it's crucial to cool the milk down quickly and refrigerate it promptly. Rapid cooling prevents the surviving bacteria from multiplying rapidly. Chilling the milk further slows down bacterial growth, helping to preserve its quality for a longer period. However, even after boiling and chilling, milk is still perishable. It's essential to use it within a reasonable timeframe, typically within 1-2 days, and always check for signs of spoilage before using it. These signs include a sour smell, curdled texture, or unusual discoloration. If any of these signs are present, discard the milk immediately.
To further extend the shelf life of boiled milk, store it in an airtight container in the coldest part of your refrigerator, usually the back of the bottom shelf, where the temperature is most consistent. Avoid storing it in the refrigerator door, as the temperature fluctuates more frequently there.